package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return User
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        //调用微信接口服务，获得当前微信用户的openid
        String code = userLoginDTO.getCode();
        String openid = getOpenId(code);

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);

        //如果是，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();//给新用户生成openid、设置注册时间
        userMapper.insert(user);
        }

        //返回这个用户对象
        return user;
    }

    /**
    * 调用微信接口服务，获得当前微信用户的openid
    * @param code
    * @return String
    */
    private String getOpenId(String code){
        //调用微信接口服务，获得当前微信用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type", "authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        log.info("微信登录的openid为：{}",openid);

        return openid;
    }
    //用户管理
    @Override
    public void save(User user) {
        user.setCreateTime(LocalDateTime.now());
        userMapper.insert(user);
    }

    @Override
    public void deleteById(Long id) {
        userMapper.deleteById(id);
    }

    @Override
    public void update(User user) {
        userMapper.update(user);
    }

    @Override
    public User getById(Long id) {
        return userMapper.getById(id);
    }

    @Override
    public List<User> listAll() {
        return userMapper.listAll();
    }

}